I bought this okudo suita renge from Maxim a while back. It was sold as a "second stone," so I want to start off by saying I am not surprised or upset that there are things wrong with this stone. Even though the toxicity wasn't mentioned in the description, I still figured it was going to be a fixer-upper. It has a few lines that take a mirror polish in contrast with the rest of the stone faces. The bigger lines also stayed a little raised above the surrounding stone when I lapped it with sic powder, so they are definitely hard lines. The lines on top are puny compared to the almost 2mm monster on the bottom. I get lots of nasty scratches in my finish when I sharpen over them, but the other half of the stone is absolutely lovely and gives a beautiful finish with great feedback. Regardless, something needs to be done about those lines. With lines that go through the stone, how far down do you guys periodically drill them out without being concerned about the structural integrity of the stone? Do you fill in the gaps with anything?